Was just wondering if anyon in here perhaps know any 240mm AIO's that has a bit shorter and more flexible tubing than for example the Corsair H100 v2 and the ASUS ROG RYUO? Since the latter has a bit thinner and way more flexible tubing than the former mentioned, although they are very long.

Trying to find one that with the most ease, will go inside an NCASE M1.

They are all roughly the same length sadly dude. If you want a shorter length youd have to buy an AIO you can take apart and cut the hoses, that would mean refilling and bleeding though so youre at the point of just watercooling tbh.

Alphacool do some good AIO options (poump in the waterblock) you could strip and make the hoses the right length